Compressor



Patented Dec. 1925. i

UNITED` STATES PATENT OFFICE.

CHARLES C.- SPREEN, OF DETROIT, MICHIGAN, ASSIGNOR, BY `MESNE ASSIGNMENTS,

MICHIGAN.

- COMPRESSOR.

Application led August 9, 1293.l Seri'al No. 656,611.

To all whom 'it may concern.' y

Beit known that I, CHARLES C. SPREEN, a citizen of the United States, residing at Detroit, in the countyv of Wayne and State of Michigan, have invented a certain new and useful Improvement in Compressors, of which the following is a full, clear, and

exact description, reference being-had tok the accompanymg drawings.

In the use of mechanicaly refrigeration for household purposes it is extremely desirable that the entire system be constructed to prevent the escape of refrigerant. Heretofore, particularly because of the difficulty 1n properly sealing the opening in the compressor through which the piston mechanism emerges, there has been provided, so far as I am `aware, no compressor which was entirely satisfactory for the purpose. My

p invention provides a satisfactory seal for this opening and, by utilizing other satisfactory apparatus, provides a' compressor completely sealed against escape of refrigerant. In thedrawings accompanying this specification and forming a part thereof I have shown, for purposes of illustration,

I one form which my invention may assume.

In these drawings: .l v

Figure 1 is a longitudinal section throu h acompressor embodying my invention, while Figure 2 is a section on 'the line'2-2 of Figure 1.

The compressor herein shown comprises a cylinder 11 secured by means of a plurality of bolts-12 to a crank case 13 provided with suitable bearings 14 and 15 arranged to. carry a drive shaft 16 which is driven b y means of a pulley 17 secured to its exterior end and drives a piston 18 by means of an eccentric 19 secured to the inner end of the shaft 16 and operating within a yoke 20 secured at one end lto the piston 18 and at the other end to a guide rod 21 which is reciprocable within a guide 22 carried by the crank case 13 and provided with an oil slot 23 ladapted vto permit the entrance into the guide 22 of the oil 24 carried within the crank case 13. Thev compressor cylinder 11 is provided with a suitable inlet port 25 co nected to the inlet duct 26 through a suita le shut-off valve 27. and is provided with a suitable outlet port 28 opening through a non-return valve'29 into' an outlet passage 30 which is connected to the outlet duct 31 throughA a suitable vshut-off valve 32.

The piston 18 is herein shown as provided with' suitable rings 33 adapted to minimize leakage' between the piston 18 and the wall ofthe cylinder 11. In actual practice, however, with the refrigerants used, it is found that such rings are not effective to entirely lprevent leakage and that the refrigerant e means lherein shown comprises a bellows 38 in the general form of a cylinder and having one edgev 39 sealed within a groove 40 in the piston 18 and the other edge 41` securely clamped by means of the bolts l12 between the cylinder 11 and the crank case 13.

It will be readily -apparent to those skilledin the art that in the compressor' herein shown I have utilized throughout apparatus offering the minimum possibility of escape of the refrigerant and that in addition, by the use of the bellows 13, I have eliminated practically the only remaining path of escape of the refrigerant.l It will therefore be apparent to those skilled in the art that the construction herein shown practically prevents the escape of refrigerant from the compressor and therefore accomplishes the primary object of my invention.`

Those skilled in the art, however, will readily realize that the construction herein shown may be variously modified without sacrificin the advantages of my vinvention or departing from the spirit thereof and that the disclosure herein is therefore illustrative only and my invention not limited thereto.

I claim.: y

1. In a compressor, a cylinder, piston, mechanism comprising a p1ston head en- TO KELVINATOR CORPORATION, OF DETROIT, MICHIGAN, A CORPORATION 0F l. gaging and `operating within said cylinderl and operating means extending from said cylinder, and a member sealed at one edge to said cylinder and at the other edge to said piston mechanism and thus effective to hermetioally seal the opening in said cylinder through which said mechanism extends, said cylinder being provided with an inlet port arranged to be uncovered by said head when said head is in advanced position to thus place said port at that time in communication With the space enclosed between said cylinder and said member.

2. In a compressor, a cylinder, piston mechanism comprising a piston head en- Leerweg gaging and operating Within said cylinder an operating means extending from said cylinder, and means hermetically sealing the opening in said cylinder through which said mechanism extends, said cylinder being provided With an inlet port arranged to be uncovered by said head when said head is` in advanced position to thus place said port at that time in communication with the space enclosed between said cylinder and said means.

ln testimony whereof, I hereunto afiX my signature.

CHARLES C. SPREEN. 

